The invention relates to an ecological slope protection device for trickle irrigation, and the device comprises a net rack which is arranged with dependence on a retainer wall or a steep slope, wherein the net rack comprises trusses arranged vertically and net rack cross beams arranged transversely, wherein the trusses are arranged transversely at intervals; the net rack cross beams are connected with the trusses, and further arranged vertically at intervals; ecological bags and plant bags are hierarchically stacked at the bottom layer of the net rack and each layer of net rack cross beam; a trickle irrigation pipe is spanned over the ecological bags and the plant bags, and provided with a trickle irrigation hole; the trickle irrigation pipe is connected with a water delivery pipe; the net rack, the trickle irrigation pipe, the ecological bags and the plant bags are combined to form a stereo planting seedling bed; and then the network of the water delivery pipe and the trickle irrigation pipe is utilized to deliver water and fertilizer, thereby guaranteeing automatic water storage and drainage of the planting seedling bed; and shrub and herbaceous plant vegetations grown in the ecological bags and the plant bags are utilized to ecologically protect the rock slope or the retainer wall. The ecological slope protection device for trickle irrigation is rational in design, easy for construction, convenient in operation, low in cost and easy for popularization, and thus can be applied to ecological protection of the steep and high rock side slope and the retainer wall.